作者机构：
[Deng, Shengfeng; Li, Wei] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.;[Deng, Shengfeng; Li, Wei] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Deng, Shengfeng; Tauber, Uwe C.] Virginia Tech, Dept Phys, Blacksburg, VA 24061 USA.;[Deng, Shengfeng; Tauber, Uwe C.] Virginia Tech, Ctr Soft Matter & Biol Phys, Blacksburg, VA 24061 USA.
通讯机构：
[Deng, Shengfeng] C;[Deng, Shengfeng] V;Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;Virginia Tech, Dept Phys, Blacksburg, VA 24061 USA.
摘要：
The contact process with diffusion (PCPD) defined by the binary reactions B + B -> B + B + B, B + B -> empty set and diffusive particle spreading exhibits an unusual active to absorbing phase transition whose universality class has long been disputed. Multiple studies have indicated that an explicit account of particle pair degrees of freedom may be required to properly capture this system's effective long-time, large-scale behavior. We introduce a two-species representation for the PCPD in which single particles B and particle pairs A are dynamically coupled according to the stochastic reaction processes B + B -> A, A -> A + B, A -> empty set, and A -> B + B, with each particle type diffusing independently. Mean-field analysis reveals that the phase transition of this model is driven by competition and balance between the two species. We employ Monte Carlo simulations in one, two, and three dimensions to demonstrate that this model consistently captures the pertinent features of the PCPD. In the inactive phase, A particles rapidly go extinct, effectively leaving the B species to undergo pure diffusion-limited pair annihilation kinetics B + B -> empty set. At criticality, both A and B densities decay with the same exponents (within numerical errors) as the corresponding order parameters of the original PCPD, and display mean-field scaling above the upper critical dimension d(c) = 2. In one dimension, the critical exponents for the B species obtained from seed simulations also agree well with previously reported exponent value ranges. We demonstrate that the scaling properties of consecutive particle pairs in the PCPD are identical with that of the A species in the coupled model. This two-species picture resolves the conceptual difficulty for seed simulations in the original PCPD and naturally introduces multiple length scales and timescales to the system, which are also the origin of strong corrections to scaling. The extracted moment ratios from our simulations indicate that our model displays the same temporal crossover behavior as the PCPD, which further corroborates its full dynamical equivalence with our coupled model.
期刊：
Journal of Statistical Mechanics: Theory and Experiment,2020年2020(4) ISSN：1742-5468
通讯作者：
Su, Zhu
作者机构：
[Deng, Weibing; Li, Wei; Zhang, Wenjun] Cent China Normal Univ, MOE, Key Lab Quark & Lepton Phys, Wuhan 430079, Peoples R China.;[Deng, Weibing; Li, Wei; Zhang, Wenjun] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Guan, Zhanpeng; Li, Jianyao] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;[Su, Zhu] Cent China Normal Univ, Natl Engn Lab Educ Big Data, Wuhan 430079, Peoples R China.
通讯机构：
[Su, Zhu] C;Cent China Normal Univ, Natl Engn Lab Educ Big Data, Wuhan 430079, Peoples R China.
摘要：
Air quality impacts people's health and daily life, affects the sensitive ecosystems, and even restrains a country's development. By collecting and processing the time series data of air quality index (AQI) of 363 cities of China from January 2015 to March 2019, we dedicated to characterize the universal patterns, the clustering and correlation of air quality of different cities by using the methods of complex network and time series analysis. The main results are as follows: (1) The air quality network of China (AQNC) is constructed by using the planar maximally filtered graph (PMFG) method. The geographical distances on the correlation of air quality of different cities have been studied, it is found that 100 km is a critical distance for strong correlation. (2) Eight communities of AQNC have been detected, and their patterns have been analyzed by taking into account the Hurst exponent and climate environment, it is shown that the eight communities are reasonable, and they are significantly influenced by the climate factors, such as monsoons, precipitation, geographical regions, etc. (3) The motifs of air quality time series of eight communities have been investigated by the visibility graph, for some communities, the evolutionary patterns of the motifs are a bit stable, and they have long-term memory effects. While for others, there are no stable patterns.
作者：
Su, Zhu;Liu, Sannyuya*;Deng, Weibing*;Li, Wei*;Cai, Xu
期刊：
Physica A-Statistical Mechanics and its Applications,2019年523:1379-1386 ISSN：0378-4371
通讯作者：
Liu, Sannyuya;Deng, Weibing;Li, Wei
作者机构：
[Liu, Sannyuya; Su, Zhu] Cent China Normal Univ, Natl Engn Lab Educ Big Data, Wuhan 430079, Hubei, Peoples R China.;[Deng, Weibing; Li, W; Li, Wei; Cai, Xu] Cent China Normal Univ, Key Lab Quark & Lepton Phys, MOE, Wuhan 430079, Hubei, Peoples R China.;[Deng, Weibing; Li, W; Li, Wei; Cai, Xu] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.
通讯机构：
[Liu, Sannyuya; Deng, WB; Li, W] C;Cent China Normal Univ, Natl Engn Lab Educ Big Data, Wuhan 430079, Hubei, Peoples R China.;Cent China Normal Univ, Key Lab Quark & Lepton Phys, MOE, Wuhan 430079, Hubei, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.
关键词：
Adaptive routing strategy;Networks of heterogeneous mobile agent;Traffic dynamics
摘要：
Based on transportation networks of mobile agents, this paper discusses the condition under which the communication radii of mobile agents obey the power-law distribution. The analysis of network structure indicates that out-degrees obey a power-law distribution, while in-degrees follow a Poisson distribution. Simulation results reveal that: (i) there exists a critical value of package generate rate P-c, which defines the free-flow state and congested state. (ii) In the free-flow regime, the average traveling time < T > is small and independent of the packet generation rate P, but the average path length < L > increases with the growth of P and is related to a traffic awareness parameter h. (iii) The larger the heterogeneous exponent alpha of the communication radii is, the lower the transport efficiency of the network would be. (iv) There exists an optimal traffic awareness parameter h that maximizes the critical value P-c. (v) The critical value P-c decreases with the heterogeneous exponent alpha, increases with the network size N, and decreases with the speed v until v reaches an appropriate value. (C) 2019 Published by Elsevier B.V.
摘要：
Graphene-based materials have potential applications in supercapacitors, owing to their unique twodimensional structure, high surface area, remarkable chemical stability, and outstanding electrical conductivity. In this work, Hummers method was used to prepare graphene oxide, and then in situ electrochemical method was firstly used to deposit graphene nanosheets on Co/CoO core-shell nano-structure to form a sandwich-type of Co/CoO/graphene electrode materials. The effect of electro-deposition graphene cycles on the electrochemical properties of Co/CoO/graphene composite were investigated. The results showed that the coating of graphene on Co/CoO further enhanced the conductivity of the material, and the specific capacitance reached 7.765 F cm(-2) at the current density of 1 mAcm(-2). The Co/CoO/graphene and AC were assembled into an asymmetric supercapacitor. After 10000 charge/discharge cycles, the total capacitance of the asymmetric supercapacitor was still maintained 79.9%. The coating of graphene not only increased the conductivity of the material, but also increased the stable of structure. (C) 2019 Elsevier B.V. All rights reserved.
期刊：
Physica A-Statistical Mechanics and its Applications,2018年494:140-162 ISSN：0378-4371
通讯作者：
Zhu, Yueying
作者机构：
[Wang, Qiuping A.; Zhu, Yueying] Le Mans Univ, IMMM, UMR CNRS 6283, F-72085 Le Mans, France.;[Zhu, Yueying; Li, Wei; Cai, Xu] Cent China Normal Univ, Complex Sci Ctr, 152 Ruoyu Rd, Wuhan 430079, Hubei, Peoples R China.;[Zhu, Yueying; Li, Wei; Cai, Xu] Cent China Normal Univ, Inst Particle Phys, 152 Ruoyu Rd, Wuhan 430079, Hubei, Peoples R China.;[Wang, Qiuping A.] HEI, Yncrea, F-59014 Lille, France.;[Li, Wei] Max Planck Inst Math Sci, Inselst 22, D-04103 Leipzig, Germany.
通讯机构：
[Zhu, Yueying] C;Cent China Normal Univ, Complex Sci Ctr, 152 Ruoyu Rd, Wuhan 430079, Hubei, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, 152 Ruoyu Rd, Wuhan 430079, Hubei, Peoples R China.
关键词：
Uncertainty analysis;Sensitivity index;Correlation;Covariance;HIV model
摘要：
Probabilistic uncertainty analysis is a common means of evaluating mathematical models. In mathematical modeling, the uncertainty in input variables is specified through distribution laws. Its contribution to the uncertainty in model response is usually analyzed by assuming that input variables are independent of each other. However, correlated parameters are often happened in practical applications. In the present paper, an analytic method is built for the uncertainty and sensitivity analysis of models in the presence of input correlations. With the method, it is straightforward to identify the importance of the independence and correlations of input variables in determining the model response. This allows one to decide whether or not the input correlations should be considered in practice. Numerical examples suggest the effectiveness and validation of our analytic method in the analysis of general models. A practical application of the method is also proposed to the uncertainty and sensitivity analysis of a deterministic HIV model.
作者：
Su, Zhu;Deng, Weibing;Han, Jihui;Li, Wei;Cai, Xu
期刊：
Journal of Physics: Conference Series,2018年1113(1) ISSN：1742-6588
通讯作者：
Su, Zhu(suz@mail.ccnu.edu.cn)
作者机构：
[Su, Zhu] National Engineering Laboratory for Technology of Big Data Applications in Education, Central China Normal University, Wuhan, China;[Han, Jihui] School of Computer and Communication Engineering, Zhengzhou University of Light Industry, Zhengzhou, China;[Li, Wei; Deng, Weibing; Cai, Xu] Complexity Science Center, Institute of Particle Physics, Central China Normal University, Wuhan, China
通讯机构：
National Engineering Laboratory for Technology of Big Data Applications in Education, Central China Normal University, Wuhan, China
期刊：
Journal of Physics: Conference Series,2018年1113(1) ISSN：1742-6588
作者机构：
Key Laboratory of Quark and Lepton Physics (MOE), Institute of Particle Physics, Central China Normal University, Wuhan, 430079, China;Commercial College, Shandong University, Weihai, Weihai, 264209, China
摘要：
Financial networks have become extremely useful in characterizing the structures of complex financial systems. Meanwhile, the time evolution property of the stock markets can be described by temporal networks. We utilize the temporal network framework to characterize the time-evolving correlation-based networks of stock markets. The market instability can be detected by the evolution of the topology structure of the financial networks. We then employ the temporal centrality as a portfolio selection tool. Those portfolios, which are composed of peripheral stocks with low temporal centrality scores, have consistently better performance under different portfolio optimization frameworks, suggesting that the temporal centrality measure can be used as new portfolio optimization and risk management tool. Our results reveal the importance of the temporal attributes of the stock markets, which should be taken serious consideration in real life applications. (C) 2018 Elsevier B.V. All rights reserved.
期刊：
Journal of Physics: Conference Series,2018年1113(1) ISSN：1742-6588
作者机构：
Research Centre of Nonlinear Science, Wuhan Textile University, Wuhan, Hubei, 430073, China;Key Laboratory of Quark and Lepton Physics (MOE), Institute of Particle Physics, Central China Normal University, Wuhan, 430079, China;IMMM, UMR CNRS 6283, Le Mans Université, Le Mans, 72085, France;School of Hautes Etudes d'Ingenieur, Yncrea, Lille, 59014, France;Max-Planck Institute for Mathematics in the Sciences, Inselst. 22, Leipzig, 04103, Germany
期刊：
Journal of Physics: Conference Series,2018年1113(1) ISSN：1742-6588
作者机构：
School of Computer and Communication Engineering, Zhengzhou University of Light Industry, Zhengzhou, China;Key Laboratory of Quark and Lepton Physics (MOE), Institute of Particle Physics, Central China Normal University, Wuhan, China
期刊：
International Journal of Modern Physics C,2017年28(8):1750109 ISSN：0129-1831
通讯作者：
Zhu, Yueying
作者机构：
[Zhu, Yueying; Wang, Qiuping Alexandre] Le Mans Univ, IMMM, UMR CNRS 6283, F-72085 Le Mans, France.;[Zhu, Yueying; Li, Wei; Cai, Xu] Cent China Normal Univ, Complex Sci Ctr, Wuhan 430079, Hubei, Peoples R China.;[Zhu, Yueying; Li, Wei; Cai, Xu] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.;[Wang, Qiuping Alexandre] Yncrea, HEI, F-59014 Lille, France.;[Li, Wei] Max Planck Inst Math Sci, Inselst 22, D-04103 Leipzig, Germany.
通讯机构：
[Zhu, Yueying] L;[Zhu, Yueying] C;Le Mans Univ, IMMM, UMR CNRS 6283, F-72085 Le Mans, France.;Cent China Normal Univ, Complex Sci Ctr, Wuhan 430079, Hubei, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.
摘要：
In the complexity modeling, variance decomposition technique is widely used for the quantification of the variation in the output variables explained by covariates. In this work, the satisfaction of sampling-based variance decomposition strategy (SVDS) is firstly testified in the implementation of an analytic method for uncertainty and sensitivity analysis (UASA) of complex systems. Results suggest that SVDS may overvalue the impacts from individual covariates alone but underestimate the effects from their interactions when the model under discussion involves the interaction effects of nonlinear problems of individual covariates. Following the phenomenon, a modification of SVDS is proposed to generate sensitivity measures that well coincide with the analytic method. The testified strategy, together with our proposed modification, is then employed to clarify the roles of infectious rate and recovered rate, as well as of their interaction, in the estimation of equilibrium state (ES) for both SIR and SIS models. Results demonstrate that infectious and recovered rates almost play the same roles less crucial than that acted by the initial susceptible individuals in the decision of ES for SIR model, accompanied by a fragile contribution from their interactions; while in SIS model, infectious rate is more robust than recovered rate, and their interaction effect is also non-ignorable.
作者机构：
[Deng, Shengfeng; Li, Wei] Huazhong Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;[Li, Wei] Max Planck Inst Math Sci, D-04103 Leipzig, Germany.
通讯机构：
[Li, Wei] H;[Li, Wei] M;Huazhong Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;Max Planck Inst Math Sci, D-04103 Leipzig, Germany.
摘要：
We study extensively the forget-remember mechanism (FRM) for message spreading, originally introduced in Eur. Phys. J. B 62, 247 (2008). The freedom of specifying forget-remember functions governing the FRM can enrich the spreading dynamics to a very large extent. The master equation is derived for describing the FRM dynamics. By applying the mean field techniques, we have shown how the steady states can be reached under certain conditions, which agrees well with the Monte Carlo simulations. The distributions of forget and remember times can be explicitly given when the forget-remember functions take linear or exponential forms, which might shed some light on understanding the temporal nature of diseases like flu. For time-dependent FRM there is an epidemic threshold related to the FRM parameters. We have proven that the mean field critical transmissibility for the SIS model and the critical transmissibility for the SIR model are the lower and the the upper bounds of the critical transmissibility for the FRM model, respectively.
